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首页> 外文期刊>RSC Advances >Highly active Ce, Y, La-modified Cu/SiO2 catalysts for hydrogenation of methyl acetate to ethanol
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Highly active Ce, Y, La-modified Cu/SiO2 catalysts for hydrogenation of methyl acetate to ethanol

机译：高活性Ce，Y，La-改性的Cu / SiO2催化剂，用于乙酸甲酯与乙醇氢化

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摘要

Rare earth element (Ce, Y, and La) modified Cu/SiO _(2) catalysts via hydrolysis precipitation and impregnation method were fabricated for the vapor-phase hydrogenation of methyl acetate to ethanol. LaO _( x ) showed the most pronounced promotion in the catalytic tests. After detailed characterizations, via N _(2) adsorption–desorption, XRD, N _(2) O chemisorption, FTIR, H _(2) -TPR, H _(2) -TPD, TEM, XPS, and TG/DTA, we found that the addition of promoter LaO _( x ) can decrease the particle size while in turn, it can increase the dispersion of copper species. The strong interactions between copper and lanthanum atoms alter the surface chemical states of the copper species. This results in the generation of more Cu ~(+) species and high S _(Cu) ~(+) values, which are responsible for the excellent activity and stability during hydrogenation. In addition, the content of additive LaO _( x ) and reaction conditions (reaction temperature and LHSV) were optimized. Then, the long-term stability performance was evaluated over the selected catalyst in contrast with Cu/SiO _(2) .
机译：通过水解沉淀和浸渍法进行稀土元素（Ce，Y和La）改性Cu / SiO _（2）催化剂，制备乙酸甲酯的气相氢化至乙醇。老挝（X）显示催化试验中最明显的促进。经过详细的特征，通过N _（2）吸附 - 解吸，XRD，N _（2）o化学吸附，FTIR，H _（2）-TPR，H _（2）-TPD，TEM，XPS和TG / DTA ，我们发现，促进剂老挝（X）的添加可以降低粒径，同时又可以增加铜物种的分散。铜和镧原子之间的强相互作用改变了铜物种的表面化学态。这导致产生更多Cu〜（+）种和高S _（Cu）〜（+）值，其负责氢化过程中的优异活性和稳定性。另外，优化了添加剂老挝（X）和反应条件（反应温度和LHSV）的含量。然后，与Cu / SiO _（2）相反，在选定的催化剂上评价长期稳定性性能。

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